Piston-ring compressor



far. 6, 1923.

' I. A. MARTINELLI PISTON RING COMPRESSOR Filed Jan. 16, 1922 7. e r, w W w a w my /4 H. w E 6 J4 a m Patented Mar. 6, 1 923.

PATENT OFF LLOYD A. MARTINELLI, OF SAN FRANCISCO, CALIFORNIA.

PISTON-RING COMPRESSOR.

Application filed January 16, 1922. Serial No. 529,608.

To aZZoo/w'm-it may concern:

Be it known that I, LLOYD A. MARTINELLI, a citizen of the United States. residing at the city and county of San Francisco and State of (alifornia, have invented certain new. and useful Improvements in Piston- Ring Compressors, of which the following is a specification.

In assembling pistons into the cylinders of internal combustion engines, the piston rings providing a tightfit between the piston and cylinder must be compressed within their grooves in the piston to admit of the insertion of the piston within the cylinder. Certain constructions permitof the insertion and removal of a piston from the upper open end of the cylinder, which opening is afford ed by removing the cylinder head, while other constructions necessitate the removal and insertion of the. pistonthrough the bottom of the cylinder, due to the integral head construction of the cylinder.

My invention provides ,what may be termed a. universal tool for use in compressing piston rings for the insertion of a piston either downwardly through the open top of the cylinder or upwardly through the open bottom thereof. The present tool is adaptedfor use under different conditions by changing the plane of the lever or handle members thereof relative to the adjustable compressing band. A further feature of the present invention is to provide a band providing a conical opening, and which is secured to the lever members through universal pivot connections whereby the minor adjustment and compression movement of the band is afforded, and which band is further provided with adjusting means affording a construction whereby the same may be varied to enable its use in connection with pistons of different diameters.

\Vith the above mentioned and other objects in view, the invention consists in the novel construction and combination of parts hereinafter described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended; it being understood that various changes in the form, proportion. size and minor details of construction within the scope of the claim may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the preferred embodiment of the inven-' tion illustrated in the drawings Fig. l discloses a view in perspective of the invention. r

Fig. 2 is a detailed broken sectional view of the preferred embodiment illustrating the same used in connection with a piston in-' scrtcd downwardly through the open top of the cylinder.

Fig. 3 is a view similar to Fig. 2, with the invention employed in connection with a piston inserted upwardly into a cylinder through the open bottom thereof.

'Fig. 4 is a fragmentary detail of the compression band. disclosing the major adjustment thereof.

In the drawings, wherein like characters of reference designate corresponding parts1 indicates the cylinder of an internal combustion engine and 2 the piston inserted therein, which piston is provided with the usual expansiblc piston rings 3 mounted in grooves 4 in the surface of the piston.

My tool for compressing the piston rings 3 within their grooves 41 during the insertion of the piston 2 within the cylinder 1, comprises a metallic band 5, circular in plan and flaring transversely from one edge to the other, providing a conical compression ring when assembled. The band-5 is preferably formed in two sections disposed at adjacent ends in overlapping relation, one

provided with spaced apertures 6 and the other with studs 7 for reception within the apertures, this construction affording a major adjustment for the band which is maintained by the nuts 8. The free ends of the two sections of the band 5. which normally lie inslight spaced relation, have radially projected therefrom, close to the edge of the band, affording the point of reduced diameter of the ring, suitable fulcrum studs 9.

on which pivot the head members 10 dis posed substantially parallel with the outer face of the band, the heads being held thereto by nuts 11.

12 indicate a pair of levers pivotally united, as at 13, and to the upper bifurcated ends 14 thereof are attached, through pins 15 disposed at right angles to the studs 9,

a band 5. a i h 4 Thief-universal connection betxveeh the band or inte'rfering with the use of the tool or its zppeizatlontwi thin, Ilitfldwillflgfi;

the crankicase ;0pening.; 1 i

the lower ends of the heads 10. the pins 15 uniting the upper ends of the levers to the heads to enable the pivotal movement of the levers at any angle to the plane of the levers 12 and the band 5 enables thehse of the tool with motorspermittingthe disposal of the levers at rightangles waieynane of" the ring, as in the case of motel having ssitating removable heads, or in motors net' the disposal of the leversana plane parallel to that of the face of the ring. occasioned by theilaclcot: room, as; in; the 92156 ot motors wherein the pist'on'sare movable g1 e entsi:

egardless,

. we; diametei'r of the ringby positioningthe bolts H 7 in'various pairs of apertures (i and overs lappingto agreatezfonless extent the seg- :mentalportions mt; the band 5, no; iproje et I: ingzlpartswofiltheband remain to interfere Wit-lrtlre free amhefiicient operation, of the I "tool; as it will be observed that ;'];7lI1S."9 f1l' e: ends of the; bandgforrning segments be to 'afiord alarger or sm 'ler diameter of the band, the excess material 15 disposed in surh manner as to protect the same from injury and to render the tool efasy pe 919%!" t .mmz mel 'mal spre (him ring and without the excess material I I claim A -piste ng compressor comprising a pair of p ivotally eonnectecllevers having at otet'l heacls movable L'rom ers into positions at a "l' ro 'viers'ely a fie i it a'pai f0" e end tion between 

